Merge pull request #4793 from barnabasdomozi/fix_list_iter

Fix cleanup sessions function

Author: bruntib

web/server/codechecker_server/session_manager.py

@@ -1161,10 +1161,10 @@ def invalidate(self, token):
     def __cleanup_sessions(self):
         self.__logins_since_prune = 0
 
-        for s in self.__sessions:
+        for s in self.__sessions[:]:
             if s.is_refresh_time_expire:
                 self.invalidate_local_session(s.token)
 
-        for s in self.__sessions:
+        for s in self.__sessions[:]:
             if not s.is_alive:
                 self.invalidate(s.token)